lecture hv measurement++
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TKE474
~ ~
Hi hVolta e
Measurement
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measurement
Measurement is the basis for theunderstanding of all kinds of deals.
Eq. Length based on the size of humanbod such as foot
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gathering physicalinformation/parameters than can
numbers.
The measuring process is one in which ther r f n r m n r
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Theneed
of
measurement.
To measure:
rmin h m ni rextent or degree of the condition
o sys em n erms o somestandard
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Measuringpurposes
in
Hig
Vo tage:
orderto
ensure
that
the
required
voltage
or
2. Checkon
the
applied
voltage
or
current
in
or ertoensuret att erequ re vo tageorcurrentwaveforms havebeenapplied.
3. Assessmentoftestresultforcompliance
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HighVoltageMeasurementTechniques
Themeasurementofvoltageandcurrentin
high
voltage
system:
Cannotbe
measured
directly
like
conventional
low
vo tagemeasur ngsystems Notonlyrms,peakvalue,shape/waveformsofsignal
shouldbemeasured
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HighVoltageMeasurementTechniques
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HighCurrentMeasurementTechniques
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MeasurementofHighDCVoltage
HighOhmic SeriesResistancewithMicroammeter
HighDC
voltage
measured
by
connectingaveryhighresistanceinserieswithamicroammeter
nl
thecurrent
Iflowin
throu h
thelargecalibratedresistanceRismeasuredbythemovingcoil
Thevoltageofthesourceisgivenby:
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MeasurementofHighDCVoltage
ResistancePotentialDividers
Thehigh
voltage
magnitude
is
givenby:
2
21 )(V
R
RR
+
acrossthelowvoltagearmR2.
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MeasurementofHighDCVoltage
MeasurementofRippleVoltageInd.c.Systems
Asimplemethodofmeasuringtheripplevoltageistouseacapacitanceresistance
componentoftheACvoltagebyblockingthe
DCcomponent.
IfV1 isthed.c.sourcevoltagewithrippleandV2 is
Cacting
as
the
blocking
capacitor,
then
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MeasurementofHighACandImpulseVoltage
1. SeriesImpedanceVoltmeter
2. Series
Capacitance
Voltmeter3. VoltageDivider4. o age rans ormer
Peakvaluemeasurement: Peakvoltmeter
p ere
gap
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Measurement
of
Hi h
AC
and
Im ulse
Volta e
1. SeriesImpedanceVoltmeter
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MeasurementofHighACandImpulseVoltage
2. SeriesCapacitanceVoltmeter
AseriescapacitorisusedinsteadofaresistorforAChighvoltage
capacitancewithaamperemeter
ecurren C ow ng roug emeteris:
IC =j CV
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MeasurementofHighACandImpulseVoltage
2. VoltageDivider
Resistivevo tage ivi er
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Measurement
of
Hi h
AC
and
Im ulse
Volta e
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Measurement
of
Hi h
AC
and
Im ulse
Volta e3. CapacitiveDivider
IC =j CV
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MeasurementofHighACandImpulseVoltage
5. VoltageTransformer
Forveryhighvoltages,cascading
ofthe
transformers
is
possible.
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Measurement
of
Hi h
AC
and
Im ulse
Volta e
PeakVoltage
Disruptivedischarge
phenomena
within
electrical
insulations stemsorinsulationmaterialsareingeneralcausedbytheinstantaneousmaximum
fieldgradients
stressing
the
materials.
Themaximumamplitudeoftheinstantaneous
o age
may
n a e
e
rea own.
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MeasurementofHighACandImpulseVoltage
PeakVoltmeter
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S here
Ga
Measurement
Simp espar gapsinsu ate yatmosp ericaircanbe
used
to
measure
the
amplitude
of
avoltage
.
themeasurementofpeakvalueofAC,DCandImpulsevoltagesandisusedforcheckingthe
voltmetersand
other
voltage
measuring
devicesusedinhighvoltagetestcircuits.
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S here
Ga
Measurement
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S here
Ga
Measurement
Thebreakdownvoltageofaspheregapincreaseswithincreaseinpressureanddecreaseswithincreaseintemperature.
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SphereGapMeasurement
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